Sheave.



No. 663,229. Patented Deb. 4, I900.

|.. A. HOERR.

SHEAVE.

(Application filed M576, 1900.)

Louis A. Hoerr A MW UNITED STATES PATENT OFFICE.-

LOUIS A. HOERR, OF ST. LOUIS, MISSOURI.

SHEAVE.

SPECIFICATION formingpart of Letters Patent No. 663,229, dated December 4, 1960.

Application filed May 5, 1900. $e1'ia1 No. 15,594. (No model.)

To all whom, it may concern:

Be it known that I, LOUIS A. HOERR, a citiuse the same, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to a sheave, and more particularly a sheave of cast metal.

The objectof my invention is to improve the construction of cast-metal sheaves, and particularly to strengthen the sheave at the point of union between the body of the sheave and its trunnions.

My invention consists in part in a metal sheave having trunnions formed integral therewith and havinga groove in its periphery and a hollow center unconnected with the trunnions and openings leading from said hollow center to said groove.

My invention also consists in other novel features, all of which are described in the following specification and pointed-out in the claims affixed hereto.

In the accompanying drawings is illustrated a sheave made in accordance with my invention.

Figure l is a vertical central section. Fig. 2 is similar to Fig. l, but shows a slight modification; and Fig. 3 is a section on the line 4 4 of Fig. 1.

Like marks of reference refer to similar parts in the several views of the drawings.

is the body of the sheave, in which is formed a groove 11, which extends inwardly sions 16, by which it is supported and which form outlet-openings 17, through which the sand core can be removed after the cast is completed, thus leaving a space 18 in the central portion 13. The trunnions 14 are also preferably cored out, as at 19, by sand cores in the usual manner. The effect of coring out the center of the sheave is to allow the center and the trunnions to contract more uniformly, and thus prevent the formation of checks or crevices at the point of union of the sheave and trunnions. It also admits of the sheaves being more uniformly annealed. This result is also facilitated by the coring of the trunnions 14. g

In case the sheave is made of ordinary gray cast-iron the core 15 may be provided with thin strips of metal 20, which produce achill on the interior of the sheave.

My sheave is much lighter and requires less metal than the sheave of the ordinary construction, which has the trunnions cast integral therewith, and I have found by experiment that a sheave made in accordance with my invention will sustain twice as much Weight as the ordinary sheave before the trunnions break.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is-

1. A metal sheave having trunnions formed integral therewith and having a groove in its periphery, a hollow center unconnected with the trunnions, and openings leading from said hollow center to said groove.

. 2. A metal sheave having trunnions formed integral therewith and having a groove in its periphery, a hollow center, openings leading from said hollow center to said groove, and openings in said trunnions unconnected with said hollow center.

3. A metal sheave having trunnions formed integral therewith, a hollow center, and metal chill-strips in said hollow center.

In testimony whereof I have hereunto set my hand and affixed my seal in the presence of the two subscribing witnesses.

LOUIS A. I-IOERR. [L. s.]

Witnesses:

JAMES H. BRYSON, W. A. ALEXANDER. 

